The rule is that punctuation always comes after the parentheses (kind of like this). This is true for periods, commas, quotation marks, etc. (unless you are quoting something inside the parentheses). You are correct in that sentence to use the period after etc. inside the parentheses because it is an abbreviation, and outside of the sentence to end the sentence. Commas are used like you have used them to list things and also to set apart people's names. Native English speakers make this mistake too, but it is correct to say "Happy Birthday, Koji" (for example) but not "Happy Birthday Koji." In the middle of a sentence, you set it apart with two commas, like this: My friend, Koji, is from Japan. Periods are used for some initials and abbreviations like U.N. or to end a sentence. Using ... implies something is being left out of a sentence Parentheses set apart information that is not really necessary to a sentence or, like you have it, to list examples of things on the side, among other uses. Hope this helps!

The punctuation is not bad. Unfortunately the rest of the grammar is not, so that is the most obvious problem. Equipment is uncountable, so does not take a plural. If you are talking in general terms, you should use plurals for your examples. After all, you will not just work on one pipe, or one pump. So: I will maintain equipment (pumps, pipes, water equipment, etc.) although - there is not really a need for the brackets there - I would just use: I will maintain equipment such as pumps, pipes, water equipment, etc.

Hello, Here you can see some common punctuation marks with their usages: ". " (full stop): To mark the end of sentence _ I like reading. After people's initial _ W. Smith Sometimes in abbreviations but often not used, especially when abbreviation has first and last letter of common word _ Dr. BBC. St. "?" (question mark): To end of a direct question _ Are you hungry? "!" (exclamation mark): To mark the end of an exclamation or strong command _ He's dead! Get out! Help! Good Lord! ", " (comma): To mark a pause between words or phrases in a list, except where they are joined by 'and' or 'or' _ It was red, green and white. Round the name of a person spoken to _ How are you, Mary? Round 'yes' or 'no' used as answers _ Yes, I can. Round greetings etc. Hello, how are you? Goodbye, I'm off. Dear Sir, yours truly In addresses (especially if written on one line) and dates _ 10th April, 2018 After subordinate phrases at the beginning of a sentence _ If it rains, we'll change our plans. Before question-tags at the end of a sentence _ You will do it, won't you? To separate non-essential phrases from the main sentence _ john, who is 90 , is in hospital. " ' " (apostrophe): To show where a letter or letters are missing in a word _ They'll ( they will) Sometimes for an unusual plural form _ Her name has two I's. To show possession especially for people _ The boy's mother (plural: the boys' mother) " ' " (inverted commas): To mark the beginning and end of direct speech (used either singly or in pairs ") _ 'How are you?' She said. ":" (colon): Used to introduce and can be used to introduce anything: words, phrases, lists, names or quotations _ The hungry buffoon only had one thing on his mind: peanut butter cupcakes. "[ ]" (brackets): Brackets are placed around extra information in a text, especially comments made by an editor.In other words, they are typically used for editorial comments, corrections, and clarifications.

"/" (slash): Used to separate parts of internet (web) addresses and file names for some computer programs. _http://www.really-learn-english.com/esl-ebooks.html Used for fractions _ 2/3 = two-thirds Used to separate the day, month, and year in dates _ 3/17/1981 (March 17, 1981) Used for some abbreviations _ w/o = without Used to show the word "or" This use of the slash is rare and should be used only in informal writing. _ Each child will take his/her science project home tonight.  Used to show the word "per" in measurements _ 150 lbs/day = 150 pounds a day or 150 pounds per day _ Used to separate lines of poetry or rhymes in regular text _Twinkle, twinkle, little star, / How I wonder what you are. / Up above the world so high, / Like a diamond in the sky. "-" (hyphen) Used to join two or more words that stand for adjective (describing word) before a noun _ chocolate-covered donuts Used when spelling out numbers between 21 and 99 _ twenty-one Use a hyphen when spelling out fractions _one-third Used to avoid confusion in meaning _ a little-used car (The hyphen is used to mean a car that is not used often.) Used with some job titles _ vice-president Used with most words that begin with the prefix self- _ self-control Used with words that begin with the prefix ex- ex-wife Used with most words that begin with the prefix non-.  _ non-smoker Used when the prefix ends in the same letter the word begins. _ inter-related Used with the prefix re- when it stands for "again" and there is confusion with another word. _ I am going to re-cover the sofa. (Use a hyphen because re-cover means to cover again.)

";" (semi-colon): Used to connect two related, or similar, sentences We connect the sentences with a semicolon to eliminate the pause between them. _ My shirt is green; my brother's is blue. Used to join two related, or similar, sentences when using a conjunctive adverb. _ We will drive to school; then we will go to the museum. I ate all of my vegetables; therefore, I should get dessert. Used to connect items in a list if there are already commas in the sentence Use this when listing dates, locations, names and descriptions. _ My favorite teachers are Mrs. White, my math teacher; Mrs. Smith, my reading teacher; and Mr. Johnson, my music teacher. Our birthdays are July 11, 2000; February 12, 2007; and April 9, 2007. I have lived in Paris, France; London, England; and Los Angeles, California. "()" (parentheses) Used to enclose information that can be left out.  The information in the parentheses is not essential to the meaning of the original sentence. it is given as additional, or extra, information. _ Sam (the boy from the school) helped me with my homework. Sometimes the information in parentheses is a complete sentence that is separate from the original sentence. _ The children won their baseball game. (It was exciting!) If you remove the information that is inside the parentheses, the sentence must still make sense. "{ }" (braces): We do not use braces very often in written language. Braces are more common in mathematics and science.